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5. Add the code in Listing 16-4 to the button3_Click method. Listing 16-4. button3_Click() Dim conn As SqlConnection = New SqlConnection _ ("Data Source=.\sqlexpress;" & _ "Integrated Security=True;" & _ "database=northwind") 'create command Dim cmd As SqlCommand = conn.CreateCommand 'Specify that a stored procedure is to be executed cmd.CommandType = CommandType.StoredProcedure cmd.CommandText = "sp_DbException_1" Try 'Open connection conn.Open() 'Execute stored procedure cmd.ExecuteNonQuery() Catch ex As System.Data.SqlClient.SqlException Dim str As String str = "Source: " + ex.Source.ToString str += ControlChars.NewLine + "Number: " + ex.Number.ToString str += ControlChars.NewLine + "Message: " + ex.Message str += ControlChars.NewLine + "Class: " + ex.Class.ToString str += ControlChars.NewLine + "Procedure: " + ex.Procedure str += ControlChars.NewLine + "Line Number: " + ex.LineNumber. ToString str += ControlChars.NewLine + "Server: " + ex.Server MessageBox.Show(str, "Database Exception") Catch ex As System.Exception Dim str As String str = "Source: " + ex.Source.ToString str += ControlChars.NewLine + "Exception Message: " + ex.Message MessageBox.Show(str, "General Exception") Finally If conn.State = ConnectionState.Open Then MessageBox.Show("Finally block Closing the connection", "Finally") conn.Close() End If End Try

Instead of the name of a specific user, you can refer to groups as well, but, if you do that, make sure to put a % sign before the group name The second part ALL in this example refers to the name of the host where the user is logged on Here, that host name has no limitations, but you can specify the name of a specific machine to minimize the risk of abuse by outsiders Next, the command that this user is allowed to use (/sbin/shutdown, no options) is specified This means that the user is allowed to run all options that can be used with this command If you want to allow the user just one option, you need to include that option in the command line If that s the case, all options that do not match the pattern you have specified in sudoers are specifically denied.

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(which is effectively an in-memory representation of a file), and MemoryStream has a constructor that accepts a byte array. So, you create a memory stream from the byte array and then create a bitmap from the memory stream.

Let s find the count of records from the Person.Contact table. Open a New Query window in SSMSE. Enter the following query and click Execute. You should see the results shown in Figure 4-13. Select count(*) as "Total Records" from Person.Contact Select count(Title)as "Not Null Titles" from Person.Contact

Follow these steps: 1. Add a Console Application project named LoadText to your solution. 2. Replace the code in Module1.vb with the code in Listing 16-4.

Now that the sudo configuration is in place, the specified user can run his commands To do this, the complete command should be referred to because the directories that typically house the root commands (/sbin, /usr/sbin) are not in the search path for normal users So, user linda should use the following command to shut down the machine: sudo /sbin/shutdown -h now.

Imports System Imports System.Data Imports System.Data.SqlClient Imports System.Data.SqlTypes Imports System.IO Module Module1 Dim fileName As String = _ "c:\bvb2005db\solutions\chapter16\loadtext\module1.vb" Dim conn As SqlConnection = Nothing Dim cmd As SqlCommand = Nothing Sub Main() Try ' Get text file GetTextFile(fileName) ' Open connection OpenConnection() ' Create command CreateCommand() ' Create table CreateTextTable() ' Prepare insert command PrepareInsertTextFile() ' Load text file ExecuteInsertTextFile(fileName) Console.WriteLine( _ "Loaded {0} into texttable.", fileName _ ) Catch ex As SqlException Console.WriteLine(ex.ToString()) Finally CloseConnection() End Try End Sub Sub CreateTextTable() ExecuteCommand( _ " if exists " _ & " ( " _

The COUNT function has different behaviors depending on the parameter passed to the function. If you try COUNT(*), the query will return you the number of total records available in the table as shown in the topmost results: table Person.Contact contains a total of 19,972 records. If you pass a column name to the COUNT function, it will return the total number of records again, but it will ignore all those rows that contain null values for that column. In the second query, you are querying the same table, which has listed 19,972 records, but as your second query applies to the Title column, it returns only 1,009 records, because this time it has ignored all null values.

Most settings discussed so far involve security measures that make your server internally secure. You must also consider, however, that something or someone from the outside world will try to connect to your server, and so you need some security at that level, too. The best way to achieve this security is with a firewall.

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Note Netfilter is a firewall that is implemented in the Linux kernel. The Netfilter firewall is manipulated by

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